Suspension for electric motors



Dec. 21 1926.

S. W. WARNER SUSPENSION FOR ELECTRIC MOTORS Filed Feb. 25

Patented Dec. 21, 1926.

UNITED STATES PATENT OFFICE.

STERLING V. WARNER, OF CRANFOR-D, NEW JERSEY, ASSIGNOR, TO THE AEOLIAN COMPANY, A CORPORATION OF CONNECTICUT.

SUSPENSION FOR Application filed February My present invention relates to a suspension for electric motors adapted to lessen the ham and vibratory noises of electric motors, these being particularly objectionable in certain kinds of devices such as electric motor driven player pianos and other musical instruments.

The suspension means constituting my present improvements are particularly effective in preventing these noises and are otherwise advantageous in providing easy belt-adjusting means and other features as will be apparent from the following description in connection with the drawings.

The drawings show a preferred embodiment of my improvements in electric motor suspension means, and specifically show same for a motor with its drive shaft positioned horizontally. My improvements have a general application but for illustration are shown operative for driving the exhauster of a player piano.

In said drawings, Fig. 1 is an elevation of an electric motor driven exhauster embodying my suspension wherein the shaft of the motor (the same being true also of the exhauster) is horizontal for use especially with an upright piano as distinguished from a grand; Fig. 2 is a combined cross sectional and elevation view on the line 22 in Fig. 1 looking in the direction of the arrows; Fig. 3 is the same on the line 33 looking in tie direction of the arrows; and Fig. l is the same on the line in Fi 1 looking in the direction of the arrows.

A is the electric motor having drive shaft 1 and drive pulley :2. The exhauster B has a casing 3 containing the pumpers and other mechanism not necessary to be shown. 41- is a pulley on the shaft 5 driven by the belt 6 from the motor pulley 2 for driving the ex- -iauster. i is a tubular elbow for connecting the automatic piano player action, etc, with the exhauster.

The motor is suspended on-a pair of bent spring metal rods 8-8, each comprising a short vertical portion 8 on the upper limb of a portion 8 whose lower limb may have a horizontal prolongation or extension 8. Said vertical portions d of the rods are screw-threaded to be screwed into threaded sockets 9 firmly secured to the sides of the motor underneath its shaft. The prolongations 8 are 'adjustably received through holes in a bar 10 secured by screws ELECTRIC MQTOIt-S.

23, 1323. Serial No. 620,858.

11 across the end of the exhauster casing adjacent its bottom. 12-'l2 are set screws for securing said prolongations 8 in any de sired position of longitudinal adjustment through said holes in said bar 10 so that the members 8 tend to press the motor yieldingly away from the enhauster. In this way, the motor is supported on the bent spring rods 8-8 with its shaft 1 substantially horizontal and substantially parallel to the shaft 5 of the exhauster, said motor being adjustable to and away from the end of the exhauster for a coarse or approximate adjustment of the belt 6.

lel l l are a pair of flexible straps of leather 01' the like whose upper ends are attached to the sides of the sockets 9 and whose lower ends are provided with loops 1s through which the lower limbs of the members 8 project. dampen vibration of the upper limbs of the spring members relatively to their lower limbs when the motor is in operation.

is a U-shaped metal member mounted upon the end of the casing of the exhauster so as to project horizontally therefrom, as best shown in Fig. l. The lower limb of this U-shaped member 15 has a slot 16 (Figs. 2 and 3). Projecting up through this slot is a flat metal piece 17 which is an integral extension from the curved metal piece 17 secured by screws to the side of the motor next the exhauster.

Between the upper and lower limbs of the U-member 15, the upper end of the piece 1'? is provider? with loop 18 adapted to be en gaged by a hook 19 on the end of a screw threaded rod 19 which projects freely through a hole in the cross piece of said U-member 1.5 beyond which said threaded rod 19 carries a washer and a wing nut 20.

The sides of the slot 16 are leather covered at 21 and said sides, by engaging the sides of the piece 1'7, check vilnration of the motor in direction endwise of its shaft. Adjusting the wing nut serves to adjust the entire motor delicately to and a my from the exhauster and acts as a delicate adjustment for properly tensioning he belt 6.

The piece 11-17 is purposely mounted on the motor nearer its pulley end as shown in Fig. 2, so that the hoolr member 19-49 and the related parts can effectively oppose the pull of the belt 6.

The described suspension means is very These straps 1ft tend to motor and pressing it yieldingly away from the driven apparatus to which the motor is belted, said spring members being adjustable to exert different pressures on said inotor; means adj ustably connecting said motor to an extraneous support for steadying the motor against the pull of the driving belt.

10. Means for supporting an electric m0- tor With its drive shaft substantially horizontal comprising spring members supporting said motor and pressing it yieldingly away from the driven apparatus to which the motor is belted, said spring members being adjustable to exert different pressures on said motor; means adjustably connecting said motor to an extraneous support for steadying the motor against the pull of the driving belt; and means -for damping Vibrations of the motor lengthwise of its shaft.

Signed at New York, in the county of New York and State of New York, this 16th day of February, A. D. 1923.

STERLING \V. \VARNER. 

